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Possible Causes

Possible Causes 
EXCESSIVE RESISTANCE IN THE B(+) CIRCUIT BETWEEN THE GENERATOR AND THE BATTERY
EXCESSIVE RESISTANCE BETWEEN THE GENERATOR CASE AND GROUND
(A804) GEN SENSE CIRCUIT SHORTED TO VOLTAGE
(K20) GEN FIELD CONTROL CIRCUIT SHORTED TO VOLTAGE
GENERATOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .